US4707601A - Position signaller which compensates for backlash in its gear transmission - Google Patents

Position signaller which compensates for backlash in its gear transmission Download PDF

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Publication number
US4707601A
US4707601A US07/013,414 US1341487A US4707601A US 4707601 A US4707601 A US 4707601A US 1341487 A US1341487 A US 1341487A US 4707601 A US4707601 A US 4707601A
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US
United States
Prior art keywords
signaller
gear wheel
transmitting element
gear
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/013,414
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English (en)
Inventor
Hans-Dieter Layh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AREG ANTRIEBE-REGELTECHNIK-ELEKTRONIK GmbH
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Individual
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Filing date
Publication date
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Publication of US4707601A publication Critical patent/US4707601A/en
Assigned to AREG ANTRIEBE-REGELTECHNIK-ELEKTRONIK GESELLSCHAFT MIT BESCHRANKTER HAFTUNG reassignment AREG ANTRIEBE-REGELTECHNIK-ELEKTRONIK GESELLSCHAFT MIT BESCHRANKTER HAFTUNG ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LAYH, HANS-DIETER
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19623—Backlash take-up

Definitions

  • the invention relates to a position signaller, in particular an end position signaller for parts of machines, in particular of machine tools or the like, the position of which can be adjusted, in particular by a motor, wherein the position signaller has a signaller part which is movable by the positioning motor or positioning drive, or by the adjustable machine part, analogously to the movements of this adjustable machine part.
  • the object underlying the invention is to provide a position signaller which combines precision with low cost.
  • the signaller part is coupled, on the one hand, drive-wise by a force transmitting connection with a transmitting element which is compulsorily coupled with the positioning motor or positioning drive, or with the adjustable machine part, and, on the other hand, in slip-free or form-locked manner with a step-down gear mechanism which exhibits backlash and which is in turn coupled in a slip-free or form-locked manner with the transmitting element and which permits the signaller part to have only a reduced speed relative to the transmitting element.
  • the transmitting element tries to drive the signaller part which is coupled thereto in force transmitting connection at a higher speed than is permitted by the step down gear mechanism. Accordingly the signaller part is held back by the step down gear mechanism relative to the movement of the transmitting element, i.e. the transmitting element leads the signaller part while overcoming a resistance which is predetermined by the strength of the force transmitting connection.
  • the transmitting element can move the signaller part with it at unreduced speed over a restricted distance which is predetermined by the play or backlash of the step down gear transmission. This signifies that the signaller part indicates a change in position of the machine part which takes place after adjusting the same by an amplified movement and thus with the highest accuracy.
  • the signaller part is arranged in force-locked manner on a shaft driven by the positioning motor or positioning drive (this shaft can for example serve in known manner to drive a spindle which moves the machine part which is to be adjusted, with the machine part which is to be adjusted cooperating with the spindle in fundamentally known manner without backlash), is also rotatable relative to the shaft against resistance and is compulsorily coupled by means of a toothed coupling, or a gear wheel which is rotatably fixedly coupled with the signaller part, with a gear wheel which is rotatably fixedly mounted on the shaft via a gear transmission which is laid out as a speed transforming transmission which exhibits backlash.
  • a corresponding arrangement can be realised at a lowest cost.
  • the signaller part meshes by means of its teeth or its gear wheel with a gear wheel of smaller diameter which is rotatably fixedly connected with a larger gear wheel; and the larger gear wheel meshes with the smaller gear wheel which is rotatably fixedly arranged on the shaft.
  • the position signaller preferably engages indirectly, by means of its teeth or its gear wheel which is rotatably fixedly connected therewith, with the small gear wheel which is rotationally fixedly arranged on the shaft of the positioning motor, via a plurality of gear wheel pairs which are rotationally journalled on an axle and also on the shaft driven by the positioning motor and which each consist of a small gear wheel and a larger gear wheel which is rotationally fixedly connected therewith.
  • the signaller part is conveniently connected in force-locked manner with the shaft driven by the positioning motor by means of a lip seal (Simmer ring).
  • a code disc is provided as the signaller part and cooperates with a light barrier arrangement, the light beam of which passes through a cut-out arranged in the code disc at a position of the code disc which is associated with the selected position or end position of the machine part.
  • the signaller part may also carry or form the tap of a potentiometer.
  • the present invention may be described as a position signalling apparatus for use with a movable machine element to signal when said machine element has reached a predetermined position, the apparatus comprising drive means for adjusting the position of said machine element; a transmission mechanism which exhibits backlash and which has an input and an output; a signaller part; and a friction coupling adapted to slip at a specific load; wherein said input of said transmission mechanism is fixedly connected to said drive means, wherein said output of said transmission mechanism is connected to said signaller element to drive the same without slip and wherein said signaller element is connected to one of said drive means and said machine element via said friction coupling.
  • FIGURE of the drawing shows, in partly schematic form, a positioning drive which serves to displace a machine part and which cooperates with a position signaller in accordance with the invention
  • a positioning motor 1 drives a spindle 3 by means of a shaft 2 with which the spindle is connected in form-locked and a backlash-free manner.
  • the spindle 3 cooperates in backlash-free manner with an adjustable machine part 4, for example a carriage or the like, and displaces it, depending on its direction of rotation, in one direction or the other in accordance with the double arrow P.
  • the gear or pinion 5 drives a pair of gears 6 which rotationally journalled on an axle 7 and consists of two gear wheels 6' and 6" which are rotationally fixedly connected to one another.
  • the larger gear wheel 6' engages with the pinion 5 while the smaller gear wheel 6" meshes with a larger gear wheel 8' of a similar pair of gears 8 which is rotationally journalled on the shaft 2 (and which can accordingly be rotated as desired relative to the shaft 2).
  • a smaller gear wheel 8" of the pair of gears 8 which is rotationally fixedly connected with the gear wheel 8' engages in turn with a larger gear wheel 9' of a further pair of gears 9 which is rotationally journalled on the axle 7.
  • the smaller gear wheel 9" of the pair of gears 9 which is rotationally fixedly connected with the gear wheel 9' meshes with a gear wheel 10 which forms part of a wheel 11 which is rotationally fixedly connected to the gear wheel 10 and is rotationally journalled on the shaft 2.
  • the wheel 11 is coupled in force-locked manner with the shaft 2 by means of a lip seal (Simmer ring) 12, i.e. the shaft 2 tries to move the wheel 11 in the prevailing direction of rotation by means of the lip seal 12 which acts as a clutch.
  • a code disc 13 having slots, cut-outs or the like 14 is arranged on the wheel 11.
  • the slots 14 cooperate with a light barrier arrangement 15 and free the path of a light beam 16 from an emitter 15' to a receiver 15" when the code disc 13 is in an appropriate position.
  • the illustrated arrangement operates as follows:
  • the cut-out or cut-outs 14 in the code disc 13 correspond to positions of the machine part 4 which are to be selected. In order to reach such a position the machine part 4 may for example be displaced to the right as shown in the drawing.
  • the spindle 3 is then driven by means of the shaft 2 with an appropriate direction of rotation in order to reach the desired position. Simultaneously the shaft 2 tries to turn the wheel 11 and the code disc 13 arranged thereon, because the wheel 11 and the shaft 2 are coupled in force transmitting connection via the lip seal 12.
  • the reduction gearing or step down gear mechanism which is formed by the pinion 5, by the gear wheel pairs 6, 8 and 9 and also by the gear wheel 10 prevents the wheel 11 being driven with the same speed of rotation as the shaft 2.
  • the ratio of the speed of rotation of the shaft 2 and of the wheel 11 is predetermined by the transmission ratio of the named reduction gearing.
  • the positioning motor 1 is stopped in known manner.
  • the spindle 3 which cooperates without play with the machine part 4, and thus also the shaft 2 which is connected without play with the spindle 3, are displaced in the corresponding direction of rotation which is opposed to the direction of rotation which was previously present during the adjustment of the machine part 4.
  • the shaft 2 can now, with the present direction of rotation, displace the wheel 11 and thus the code disc 13 through a certain angle at a speed which is non-reduced relative to the shaft 2 until the reduction gearing can again slow down the movement of the wheel 11 and of the code disc 13.
  • the invention is not restricted to an arrangement with rotating parts.
  • a corresponding arrangement is also possible in the same sense if one part of the elements of the transmission gearing, or all of its elements, and/or the elements which serve to displace the machine part 4 and also the signaller part which is adjusted in analogous manner execute translatory movements.
  • a lever transmission or the like can also be provided in place of a gear transmission.
  • the signaller part 11, 13 can also serve to adjust a non-illustrated potentiometer so that a voltage can be tapped off which is analogous (proportional) to the position of the signaller part 11, 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Control Of Position Or Direction (AREA)
US07/013,414 1984-02-22 1987-02-11 Position signaller which compensates for backlash in its gear transmission Expired - Fee Related US4707601A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3406336 1984-02-22
DE19843406336 DE3406336A1 (de) 1984-02-22 1984-02-22 Positionsgeber, insbesondere endlagengeber

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06697347 Continuation 1985-02-01

Publications (1)

Publication Number Publication Date
US4707601A true US4707601A (en) 1987-11-17

Family

ID=6228460

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/013,414 Expired - Fee Related US4707601A (en) 1984-02-22 1987-02-11 Position signaller which compensates for backlash in its gear transmission

Country Status (2)

Country Link
US (1) US4707601A (de)
DE (1) DE3406336A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106525086A (zh) * 2016-11-08 2017-03-22 莱芜钢铁集团电子有限公司 一种旋转编码器冗余检测的安装***及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123653A (en) * 1975-12-31 1978-10-31 Ing. C. Olivetti & C., S.P.A. Arrangement for detecting the angular position of a rotatable part
US4363026A (en) * 1981-04-24 1982-12-07 Otis Elevator Company Position encoder update mechanism and method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123653A (en) * 1975-12-31 1978-10-31 Ing. C. Olivetti & C., S.P.A. Arrangement for detecting the angular position of a rotatable part
US4363026A (en) * 1981-04-24 1982-12-07 Otis Elevator Company Position encoder update mechanism and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106525086A (zh) * 2016-11-08 2017-03-22 莱芜钢铁集团电子有限公司 一种旋转编码器冗余检测的安装***及方法

Also Published As

Publication number Publication date
DE3406336A1 (de) 1985-08-22
DE3406336C2 (de) 1988-10-20

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Owner name: AREG ANTRIEBE-REGELTECHNIK-ELEKTRONIK GESELLSCHAFT

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Effective date: 19951122

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362